<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        *{padding:0; margin:0;}
        form{
            width:294px; height:48px;
            border: solid 1px #dbdbdb;
        }
        form input{
            width:243px;
            height:48px;
            border:0;
            /* 去掉input自带的边框线 */
            float:left;
            outline:none;
            /*  outline:none;去掉轮廓线 去掉input鼠标获取焦点一下出现的边框线 */
        }
      
        form button{
            width:50px; height:48px;
            border: none;
              /* 去掉button自带的边框线 四个边 */
           float:left;
           background-color: #fff;
           border-left: solid 1px #dbdbdb;
        }
    </style>
</head>
<body>
    <form>
        <input type="text" value="请输入你的关键户"/>
        <button><img src="images/coding_06.jpg" alt=""></button>
    </form>
</body>
</html>